Joining of GR2-GR5 Titanium
alloys with Aluminum interlayer
by diffusion welding method
Journal Name:
- Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi
Keywords (Original Language):
| Author Name | University of Author | Faculty of Author |
|---|---|---|
Abstract (2. Language):
In this study, the effect of the joint temperature of the
GR2 and GR5 (Ti6Al4V) alloys and the weld
temperature on the joint were investigated using the
Al intermediate layer.
Today, Titanium and Titanium alloys are
increasingly used in the metal material
industry. Non-magnetic Titanium has the
characteristics of higher melting temperature, high
formability, high strength, good toughness, low
density (4.54 g / cm3), biocompatibility and good
corrosion resistance to steel (therefore used in the
space industry) and high performance is often
required in applications .
For this reason, GR2 and GR5 alloys which are
widely used in this study are used. The results of the
experiments showed that the final joints consisted of
Ti base materials and Ti-Al solid solution. It has
been found that the intermetallic TiAl phase
deposited on the surface of the Al intermediate layer
has no detrimental effect on the strength of the
joints. For this reason the Al layer is used as an
intermediate layer. The diffusion source material
facilitates its assembly by rapid deformation of the
microstructure and minimal deformation. The
process depends on a number of parameters,
especially the combination temperature,
atmospheric, time, pressure and surface roughness.
Common alloy problems (brittle phase formation
and limited mutual solubility), large differences
between melting points, differences in the thermal
conductivities of the parent metals, oxidation, are
known to be the main factors affecting the integrity
of the source region of the unique metal fusion
source. Within the confines of the fusion welding
process, fusion welding problems can be removed at
different metal welding locations as previously
described. Many of the high-performance metals,
and their various compositions, can be combined by
solid state bonding methods, even if the alloying
elements present in these metals are small.
The study was carried out with a diffusion welding
apparatus with fixed source pressure specially
designed at 850, 900 and 950 ° C under a constant
argon atmosphere of 5 MPa, 55 minutes. In the
diffusion welding process, the temperature is
selected as the variable parameter and the welding
pressure and welding time are kept constant. The
samples were kept in the oven at an oven
temperature of 250 ° C, then kept at room
temperature until it cooled down. Microhardness
test was also applied to the samples to determine the
hardness distribution at the interface.
Hardness measurements were made at 10 microns
intervals to determine the hardness changes at the
interfaces with the Leica TKF-10 (0.05 HV) under
50 gr load. Microstructure changes after welding
were examined by optical microscope and the
possible phase constants and the elements passing
through the diffusion zone EDS analysis was carried
out.
These tests were carried out on all samples and
found that the welded T3 specimen welded at 950 °
C had the best bond quality. Al intercalation
observed that all the samples were diffused at a rate
of 30-40 μm to the main material.
All the samples according to the XRD analysis
made, Ti12Al, Ti205Al117, Ti205Al117, Ti216All3,
Ti6875Al226V157, Ti119Al12V7, Ti187Al19V1 phases were
found intensely.
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Abstract (Original Language):
GR2 ve GR5 (Ti6Al4V) titanyum alaşımları üstün mühendislik özellikleri nedeniyle özellikle biyomedikal
(ortopedi, cerrahi malzemeler ve implantlar), uçak gövde iskeletlerinde, uzay ve metal-malzeme
endüstrisinde sıklıkla kullanılmaktadır. Titanyum malzemelerin yüksek süperplastik deformasyon özelliği,
çeliğe göre korozyona daha dayanıklı olması, düşük yoğunluğu, yüksek korozyon direnci istenen yerlerde
manyetik olmayan bu alaşımların mükemmel yapısı malzeme teknolojisinin gelişmesiyle önemini daha da
artırmıştır.
Bu çalışmada GR2 ve GR5 (Ti6Al4V) çubuk malzemeler alüminyum ara tabaka kullanılarak difüzyon
yöntemiyle kaynaklanmış ve kaynak sıcaklığının bağlantı üzerindeki etkisi incelenmiştir. Malzeme çiftleri 5
MPa basınçla silisyum çubuklu fırında argon gaz ortamında 55 dk’lık sabit kaynak süresi ve 850–900 ve 950
°C’lik sıcaklıklarda birleştirilmişlerdir. Birleştirilen numunelerin SEM-EDS analizleri yapılmış difüzyondan
etkilenen bölgedeki aratabakanın optik mikroskopla metalografik yapısı incelenmiş ve XRD analizi yapılarak
olası fazlar belirlenmeye çalışılmıştır. Bağlantı bölgesinin bindirme-kayma mukavemet ve mikro sertlik
değerleri incelenmiş en yüksek mekanik özellikler T3 numunesinde elde edilmiştir.
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